From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965876Ab2JZSRu (ORCPT ); Fri, 26 Oct 2012 14:17:50 -0400 Received: from usmamail.tilera.com ([12.216.194.151]:20740 "EHLO USMAMAIL.TILERA.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965556Ab2JZSRt (ORCPT ); Fri, 26 Oct 2012 14:17:49 -0400 Message-ID: <508AD3CB.8070303@tilera.com> Date: Fri, 26 Oct 2012 14:17:47 -0400 From: Chris Metcalf User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20121010 Thunderbird/16.0.1 MIME-Version: 1.0 To: Ben Hutchings CC: , Subject: Re: [PATCH] tilegx: fix some issues in the SW TSO support References: <201210251737.q9PHbgev032681@farm-0012.internal.tilera.com> <1351187513.2662.9.camel@bwh-desktop.uk.solarflarecom.com> <508981E1.4030600@tilera.com> <1351193806.2662.18.camel@bwh-desktop.uk.solarflarecom.com> <1351194525.2662.21.camel@bwh-desktop.uk.solarflarecom.com> In-Reply-To: <1351194525.2662.21.camel@bwh-desktop.uk.solarflarecom.com> X-Enigmail-Version: 1.4.5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/25/2012 3:48 PM, Ben Hutchings wrote: > On Thu, 2012-10-25 at 20:36 +0100, Ben Hutchings wrote: > [...] >> There's a simple way to test this - configure the 'attacker' host and >> interface like this: >> >> # ip link set $IFACE mtu 128 >> # sysctl net.ipv4.route.min_adv_mss=88 >> >> and then use something like netperf to generate a high bandwidth stream >> of TCP traffic toward it from the tilegx interface. > Also you would need to run some other traffic in parallel (multiple > streams to the 'attacker' and some more normal streams) to ensure there > is real contention. Thanks! I've filed a bugzilla within Tilera to come back and revisit this - I think it's not a short-term problem so we'll find some time to look at it in the future. Or, someone reading this could try it themselves and submit the patch :-) -- Chris Metcalf, Tilera Corp. http://www.tilera.com